With Swagger integration EJB injection fails in weblogic 12 env

[venkatesh g]

Dear Team,

I was trying out the example from https://github.com/wordnik/swagger-core/tree/master/samples/java-jaxrs and deploying the same in Weblogic 12c + JDK 1.7 environment. With this EJB injection is failing. Any idea, please share.

Given below the slightly modified code in the example https://github.com/wordnik/swagger-core/tree/master/samples/java-jaxrs,

@Path("/pet")

@Api(value = "/pet", description = "Operations about pets")

@Produces({"application/json", "application/xml"})

@Stateless

public class PetResource {

  static PetData petData = new PetData();

  static JavaRestResourceUtil ru = new JavaRestResourceUtil();

  

  @EJB

private HelloWorld hWorld; // EJB injection

......

.......

  public Response getPetById(

      @ApiParam(value = "ID of pet that needs to be fetched", allowableValues = "range[1,5]", required = true) @PathParam("petId") String petId)

      throws NotFoundException {

System.out.println("hWorld " + hWorld); // Returns null i.e injection does not happen

}

HelloWorld EJB:-

===============

package com.wordnik.swagger.sample.ejb;

import javax.ejb.Stateless;

@Stateless

public class HelloWorld {

public void hello(String name) {

System.out.println("Hello " + name);

}

}

[tony tam]

Hi, can you share more details?  Many people use swagger in an environment like this without issue.

[venkatesh g]

It will be great if someone can crack this puzzle. Sharing the additional details, please help.

Environment:-

Weblogic 12c (12.1.1) + JDK 1.7.0

Steps to reproduce the issue i.e EJB injection fails:-

1) Download the source code from Swagger github https://github.com/wordnik/swagger-core/tree/master/samples/java-jaxrs

2) Add the EJB injection as mentioned in the attached file PetResource.java or Replace the downloaded PetResource.java code in the above step with the attached PetResource.java file. Also include HelloWorld EJB under the folder com\wordnik\swagger\sample\ejb

3) Run the build mvn clean install

4) Rename swagger-java-sample-app_2.10-1.3.1.war to swagger-java-sample-app.war [For context path]

5) Deploy in Weblogic 12c (12.1.1) environment http://www.oracle.com/technetwork/middleware/ias/downloads/wls-main-097127.html

6) Run the Swagger code http://localhost:7001/swagger-java-sample-app/pet/1, which will give you Null pointer exception as EJB injection fails

@EJB 

  private HelloWorld hWorld; //EJB injection

  

  public Response getPetById(

      @ApiParam(value = "ID of pet that needs to be fetched", allowableValues = "range[1,5]", required = true) @PathParam("petId") String petId)

      throws NotFoundException {

System.out.println("petId " + petId);

System.out.println("hWorld " + hWorld); // This will return null in Weblogic 12c environment with JDK 1.7.0

hWorld.hello("Injection works"); // This will throw null pointer exception as EJB injection fails 

Regards

Venkatesh

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[venkatesh g]

I was able to crack the puzzle. In the github example, I have changed the following line in the web.xml and EJB injection works.

 

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

 

Thanks. This thread is closed.

 

Regards

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